Contact details: You can contact this RBL by filling up the form found on their contact page, linked above.

Delisting procedure: First you would need to solve the issues on your server or network, that got your IP blacklisted in the first place. Then, proceed to looking up the IP address on their website (links provided above). On each lookup result page, you will be presented with delisting buttons.

Additional info: Delisting from the DYN blacklist appears to be free of charge, however you may be asked for a sum of money when attempting to delist your IP from the SBL blacklist. Some sources claim this RBL is fake or scam for asking delisting fees, so please be warned and inform yourself before making a decision regarding this RBL.